Re: Unsupported brightness interface on X1 Carbon (1st gen)

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On Wed, 09 Apr 2014, Tyler Brock wrote:
> Any thoughts guys? This laptop has been out for a while so I'm not sure why
> it would be unsupported. I'd be happy to help code something up if we need
> to fix something and you point me in the right direction.

It is unsupported because I don't have one, and the people who have some
docs and a X1C to test are starting to provide patches.  I've ACK'd a few of
them very recently.

It will take a while yet for all of them to land on a released kernel (3.15
at the very least), unless some of them are backported (there are several,
including patches to enable the sensors hub for the Helix which likely is
also required on the X1C, etc).  I *think* there's even a BIOS update that
Lenovo should issue in the next few weeks to solve some nastiness on
suspend/resume... but I don't recall right now if it is for the X1C or the
Helix.

You can hunt down the patches on the list archives for ibm-acpi-devel, and
also the platform-driver-x86 ML (at vger.kernel.org) and LKML (the sensor
hub one).

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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